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Sunchokes are the knobby tubers of a North American sunflower, Helianthus tuberosus, and despite the other common name, Jerusalem artichoke, they are not a close relative of the globe artichoke. The tuber stores much of its carbohydrate as inulin, a fiber your small intestine cannot digest, so gut bacteria ferment it instead, and that can mean gas and bloating for some people. This guide covers sunchoke nutrition from the USDA database, the botany behind the confusing name, what research and Monash University say about inulin and gas, and plain kitchen tips on how to cook sunchokes.
Peptide Labs does not sell sunchokes or sunchoke products. This article is general nutrition information, not medical advice.
Key Takeaways
- Sunchokes are tubers of Helianthus tuberosus, a sunflower native to North America, according to the USDA PLANTS Database.
- Jerusalem artichoke and globe artichoke share only the aster family; they belong to different genera.
- Per USDA, one cup of raw slices has about 110 calories, 28% of the Daily Value for iron and 25% for thiamin.
- Inulin is a fermentable fiber; Monash University explains that gut bacteria ferment fructans and produce gas, which happens in everyone.
- A 2024 review says large amounts can cause abdominal discomfort, bloating and flatulence in people with low tolerance to inulin and fructose.
What are sunchokes?
The USDA PLANTS Database lists Helianthus tuberosus, common name Jerusalem artichoke, as a perennial in the aster family (Asteraceae) and the sunflower genus, native to Canada and the lower 48 states. A 2024 review in Pharmaceuticals adds that the plant was later introduced to Europe and Asia as a cultivated crop. Above ground it looks like a tall, narrow sunflower with small yellow flower heads; below ground it forms clusters of lumpy tubers with thin tan, red or purple skin and crisp white flesh. Raw, the texture is close to a water chestnut; cooked, it turns soft and creamy, with a sweet, nutty taste some people compare to artichoke hearts.
Why the Jerusalem artichoke is not a real artichoke
The globe artichoke is Cynara cardunculus var. scolymus, and the part we eat is an immature flower bud. USDA PLANTS places Cynara in the same aster family as Helianthus, but in a different genus, so the two plants are not close relatives. The two foods also differ on the plate: one is a tuber you scrub and roast, the other a thistle bud you trim and steam. Our globe artichoke guide covers the flower bud; “sunchoke” is simply the less confusing name for the tuber.
Sunchoke nutrition facts
The table uses the USDA FoodData Central SR Legacy entry for raw Jerusalem artichokes (FDC 169236), calculated for the USDA portion of one cup of slices (150 grams). Percent Daily Values use the FDA reference amounts. SR Legacy has no entry for cooked sunchokes.
| Nutrient | Raw, 1 cup slices (150 g) | %DV |
|---|---|---|
| Calories | 110 | |
| Carbohydrate | 26.2 g | 10% |
| Total sugars | 14.4 g | no DV |
| Fiber | 2.4 g | 9% |
| Protein | 3.0 g | 6% |
| Iron | 5.1 mg | 28% |
| Thiamin | 0.30 mg | 25% |
| Copper | 0.21 mg | 23% |
| Potassium | 644 mg | 14% |
| Niacin | 2.0 mg | 12% |
| Phosphorus | 117 mg | 9% |
| Vitamin C | 6 mg | 7% |
| Sodium | 6 mg |
Two things stand out. First, USDA lists 3.4 milligrams of iron per 100 grams of raw sunchoke, high for a tuber; it is the non-heme form found in plants, and our foods high in iron guide explains what that means. Thiamin and copper are also notable. Second, the fiber figure looks small for a food known as an inulin source. Standard fiber numbers do not show inulin well; USDA researchers had to build a special database just to estimate how much inulin Americans eat. Our prebiotic foods list makes the same point about chicory root.
How sunchokes compare with other root vegetables
Per 100 grams in USDA SR Legacy data, sunchokes have about the same calories and carbohydrate as raw potatoes but far more sugar: 9.6 grams versus under 1 gram.
| Food (USDA SR Legacy, per 100 g) | Calories | Carbohydrate | Sugars | Fiber | Potassium | Iron |
|---|---|---|---|---|---|---|
| Sunchokes, raw (169236) | 73 | 17.4 g | 9.6 g | 1.6 g | 429 mg | 3.4 mg |
| Potatoes with skin, raw (170026) | 77 | 17.5 g | 0.8 g | 2.1 g | 425 mg | 0.8 mg |
| Parsnips, raw (170417) | 75 | 18.0 g | 4.8 g | 4.9 g | 375 mg | 0.6 mg |
| Globe artichoke, raw (169205) | 47 | 10.5 g | 1.0 g | 5.4 g | 370 mg | 1.3 mg |
Because they are starchy and sweet, sunchokes sit with the foods in our starchy vegetables guide. For other potassium sources, see foods high in potassium, and for more root vegetables, our sweet potato guide.
Inulin and gas: why sunchokes have a reputation
Inulin is a chain of fructose units, a type of fructan. A 2018 review in Current Developments in Nutrition lists Jerusalem artichokes among the foods that contain it naturally, and inulin is one of the universally agreed prebiotics. Our inulin guide covers the isolated fiber sold in powders.
Monash University, which developed the low FODMAP diet, explains that fructans are fermented by bacteria in the large intestine, producing gas. That happens in everyone, and most people eat these foods without trouble; people with irritable bowel syndrome can have a more sensitive gut. A 2007 Monash study measured fructans in 60 vegetables and noted they can cause digestive symptoms in some individuals. The Monash food list does not name sunchokes specifically, so we do not claim a Monash rating for them.
Research on inulin itself points the same way. In a 2014 study of 29 healthy adults, agave inulin caused slight increases in bloating and flatulence, with low overall intolerance scores. A 2024 review of Helianthus tuberosus states that excessive consumption may lead to abdominal discomfort, bloating and flatulence in people with low tolerance to inulin and fructose. Our low FODMAP diet guide explains how a dietitian tests which fermentable carbohydrates bother a person. If gas or pain is new, severe or comes with unexplained weight change or blood in the stool, see a clinician rather than blaming one food.
Are sunchokes healthy?
They are a whole vegetable with almost no fat or sodium, some potassium, and notable iron, thiamin and copper per USDA. Lab and animal studies on the tuber and its extracts are common, but the 2024 review calls the human evidence for metabolic effects scanty, and a 2026 review says clinical validation remains limited. So the honest answer is that sunchokes are a reasonable starchy vegetable to rotate in, and whether the inulin agrees with you is personal. Rye is another fructan-containing food; our rye guide covers the grain.
How to cook sunchokes
This is plain kitchen guidance, not a health claim:
- Choosing: pick firm tubers with smooth skin and no soft or sprouting spots; fewer knobs make cleaning easier.
- Cleaning: scrub well with a vegetable brush. The thin skin is edible, so peeling is optional.
- Roasting: cut into even chunks, toss with oil and salt, and roast until browned outside and creamy inside.
- Soups and mash: simmer until tender, then blend into soup or mash with potatoes.
- Raw: thin slices add crunch to salads. Cut flesh darkens in air, so drop slices into water with a little lemon juice.
- Storing: keep unwashed tubers in a bag in the refrigerator so the thin skin does not dry out.
Frequently Asked Questions
Is a sunchoke the same as a Jerusalem artichoke?
Yes. Both names refer to the tuber of Helianthus tuberosus, a sunflower native to North America.
Is a sunchoke a kind of artichoke?
No. Both are in the aster family, but the globe artichoke is Cynara and the sunchoke is Helianthus.
Why do sunchokes cause gas?
They contain inulin, a fructan that gut bacteria ferment in the large intestine, producing gas. How much it bothers you varies from person to person.
Can you eat sunchokes raw?
Yes. Raw slices are crisp like water chestnuts. Scrub them well and keep cut pieces in lemon water to slow browning.
Do you need to peel sunchokes?
No. The skin is thin and edible. Many cooks just scrub them clean.
Are sunchokes low FODMAP?
Monash lists fructans as a FODMAP but does not name sunchokes on its high and low FODMAP foods page. A dietitian can help if you follow a low FODMAP plan.
Questions about a label? Contact us or read our Buyer’s Guide. Food comes first; follow the label and ask a healthcare provider before starting a supplement, especially if you take medicines, are pregnant or have a food allergy. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed October 2026.
Related guides: Rye: Grain and Flour Nutrition, Gluten and Ergot Facts, Prebiotic Fiber Supplements: Inulin, FOS and What the Research Shows, Prebiotic Foods: A Practical List and What the Research Shows.